Device for use in connection with fuel injection pumps for adjusting the delivery thereof



Sept. 22, 1959 K. ZIESCHE ETAL DEVICE FOR USE IN CONNECTION WITH FUELINJECTION PUMPS FOR ADJUSTING THE DELIVERY THEREOF 5 Sheets-Sheet 1Filed Feb. 20, 1956 FIG. 2

FIG. I

I lll lll h Qg AI Sept. 22, 1959 K. ZIESCHE ETAL 2,905,020

DEVICE FOR USE IN CONNECTION WITH FUEL INJECTION PUMPS FOR ADJUSTING THEDELIVERY THEREOF Filed Feb. 20, 1956 s Sheets-Sheet 2 Sept. 22, 1959 K.ZIESCHE ET AL 2,905,020

DEVICE FOR USE IN CONNECTION WITH FUEL INJECTION PUMPS FOR ADJUSTING THEDELIVERY THEREOF 5 Sheets-Sheet 3 Filed Feb. 20, 1956 INVENIGPS fur) O Wn/a United States Patent'O DEVICE FOR USE IN CONNECTION WITH FUELINJECTION F311 ADJUSTING THE DE- LIVERY IIFHEREGF 'Kurt Ziesche,Koln-Dunnwald, Anton Kobus, Koln-Mnlhelm, and Oswald May, Bonn, Germany,assign'ors to KIiickner- HumholdnDeutz, Akfie'ngesellschaft, Kohl,*Germany The present invention relates to fuel injection pumps, and moreparticularly, to a device for use in connection with such pumps foradjusting the delivery thereof in connection with the starting of aninternal combustion engine Su'ch devices which are adjustable in such amanner that the delivery for the starting period is in excess of the'full load delivery during the normal operation of the internalcombustion engine equipped with such fuel injection pump must bedesigned in such a manner that it will safely prevent the adjustment ofthe starting fuel quantity while the engine is running. 'The reason forthis consists in that during normal operation of the i engine, theengine cannot process the said starting fuel quantity and thereforecauses the exhaust to smoke excessively.

The heretofore known adjusting devices used in connection with fuelinjection pumps comprise an abutment connected to a control rod, whichabutment detei mines the full load delivery of the injection pump duringnormal operation of the engine. Following the turning off of the engineorprior to the starting of the engine, the said abutment is madeineffective by actuating means out- "side the injection pump',.'butafter a minor movement of the control rod in the direction toward areduced charge, the said abutment automatically becomes effective again.

It is, therefore, an object of the present invention to provideadjusting means associated with a -fuel injection pump, which will allowthe "adjustment of a starting fuel delivery but will be considerablysimpler and more reliable than the heretofore known devices of thistype.

It is another object of invention to provide adjusting means of the typeset forth in the preceding paragraphs which, while preventing theadjustment of the fuel pump for delivery of a starting quantity of fuelwhile the engine is running, will be so simple that it may also be emloyed with fuel injection pumps for engines of a low number ofcylinders, for instance, for one or two cylinder engines.

It is still another object to provide adjusting means of the type setforth in the preceding paragraphs, which will make it impossible, evenwhen using certain tools from the outside of the adjusting means toeffect an'adjus'tment for delivering an increased starting quantity offuel while the engine is running.

These and other objects and advantages of the invention will appear moreclearly from the following specification in connection with theaccompanying drawings, in which Fig. l is a longitudinal se'io'n througha one cylinder fuel injection pump according to the invention, said section being taken along the line I-I of Fig. 2.

Fig. '2 is a partial section through Fig. 1 taken along the line HIIthereof.

"Fig; 3 is a section taken along the line IIIIII of Fig. 2 but with asomewhat modified abutment element.

Fig. 4 is a modification of an arrangement according to the presentinvention and represents a section taken along the line IV-IV of Fig.5..

Fig. 5 is a section along the line V-V of Fig. 4.

7 General arrangement The adjusting deviceaccording to the presentinvention consists primarily in that a bending .is employed asstationary abutment which extends parallel to the control rod atleastswithin the range of movement of theabutment connected to thecontrol nod. Said lastmentioned abutment in addition to being providedwith an abutment surface for engagement by the of the nonbent bendingspring is provided an aperture, while :an actuating member operable"from the outside of the injection pump "is adapted so to actuate thebending spring that its tip is deflected into a position within the:area of said apertune to thereby initiate the adjustment of thepumpufor delivering the increased quantity of. fuel desired .forstarting the engine. As actuating member, there may, for instance, beemployed a bolt which :is displaceably mounted in the casing and ismovable perpendicular to the longitudinal extension of the bendingspring. The arrangement is such that the inner end .face of the boltengages the bending spring. In its most simpleforrm, a spring wire mayhe used as bonding spring. For .pur poses 'of adjusting the admissiblerfull load fuel delivery of the pump .for normal operation, the spring.wire is connected to an adjusting screw screwed into easing of the pump.

According to a further development of the invention, the abutmentsurface on the control rod is so arranged that a. sheet metal plate isconnected to a flattened portion of the control rod in :such a mannerthat the said plate is parallel to the axis of the control rod. 'IDhesaid sheet meta-lp-late is provided with an ear having its major surfacelocated in a plane perpendicular the longitudinal axis 'of the controlrod. It is the sunface of the :said earwhich serves as abutment surface.When providing the said sheetnietal plate with a second ear spaced fromand parallel to said first ear, the adjustment of the delivery forstarting the engine will beirn'ade impossible wh-ile theinternalcombustion engine is running.

Stmcmr'al arrangement Referring to the drawings in detail, and Figs. 1and 2 thereof in particular, the fiuel pump shown therein com prises incustomary manner a casingsl, a'pump cylinder 2, a pressure valve 3 an'dapiston 4 reciproeable in said pump cylinder. .For purposes of varyingthe quantity of fuel to be injected, the piston 4 .is notat-ablyadjustable. Depending on the rotative position of the piston 4,, the,efiective delivery stroke is completed earlier or later by sliding ofthe inclined control slot 5 over the connectirrg bore leading to theoverflow passage of -the pump. The rotative or angular adjustment of thepump piston 4 .is effected by means of a control rod 6 which is displaceably mounted in the casing 1. For each cylinder, the control rod :6has screwed thereinto a screw 7 with ball head 8. The screw 7 with ballhead 8 extends into an axial groove of the piston 4. The drive of thepump piston 4 :is effected through ia push rod with roller 9 to beactuated by the :cam shaft (not shown? of the internal combustion engineto be driven.

A sheet metal plate 1'0 is connected to the control rod by means of thesaid screw 7. This sheet metal plate 1 0 has two ears 11 and 12 which,while being substantiallyparallel to each other extend in planes:directed substantially perpendicular to the axis of the control rod :6.That surface of the ear .1 2 which is arranged on that side of the sheetmetal plate 10 which faces the idling position of the control rod 6 actsas full load abutment in cooperation with a spring wire 13. The saidspring wire 13 is connected to an adjusting screw .14. screwed into thecasing 1. Directly adjacent the bending edge .15. of the ear 12,, thelatter is provided with a rectangular cutout or window 16. For purposesof adjusting the quantity of fuel desired for starting the engine, thetip of the spring wire 13 which normally by abutment against the ear 12limits the full load quantity of fuel during normal operation of theengine, is bent or deflected in front of the window 16. This deflectionis effected by means of a bolt 17 mounted in the casing 1. It will beappreciated that if the tip of the spring wire :13 is deflected into aposition in front of the window 16, the spring 18 acting upon thecontrol rod 6 will then pull the latter outwardly so that the car 12moves toward the left with regard to Fig. 1 over the spring wire 13,thereby causing the ball head 8 engaging the groove 4' to turn orangularly adjust the piston 4 and thereby the slot 5 in the directionfor causing the pump to deliver a starting quantity of fuel in excess ofthe normal full load quantity of fuel during the ordinary operation ofthe engine. The bolt 17 is provided with a pin 20 extending in adirection transverse to the axis of the bolt 17. The said pin 20 limitsthe outward movement of the bolt 17, which latter, by means of a spring23, is continuously urged toward the outside. The movement of the ear 12over the wire spring 13 is limited by engagement with a sleeve 19surrounding the wire spring 13 and mounted stationarily in the casingfor the fuel pump.

The device of Figs. 1 and 2 is characterized by great simplicity and dueto its few parts and small size may, as shown in the drawing, beemployed in connection with a one cylinder injection pump.

The operation of the device of Figs. 1 and 2 is as follows. It may beassumed that the internal combustion engine equipped with a fuel pumpand the control system of the present invention is at a standstill. Thecontrol rod 6 will then occupy the position shown in Figs. 1 and 2 inwhich the ear 12 abuts the adjacent end of the wire spring 13. Thecontrol rod 6 which is operatively connected to the governor of theinternal combustion engine pulls the control rod 6 into the positionshown in Figs. 1 and 2 when the internal combustion engine is at astandstill. The position of control rod 6 as shown in Figs. 1 and 2corresponds to the full load filling.

For starting the internal combustion engine, a filling or fuel volume inexcess of said full load filling is required. T his starting filling isadjusted by pressing upon the knob of bolt 17. Bolt 17 will then pressagainst the wire spring 13 and deflect the same laterally until the wirespring 13 comes within the range of the rectangular window 16. In thisinstance, the control rod is released so that it will be able to move ina direction to increase the filling. The starting filling thusobtainable is determined by the adjustment of the tube 19 against whichcar 12 will abut.

It will thus be obvious that after the operator has actuated bolt 17,the filling required for the starting of the internal combustion enginewill automatically adjust itself so that the internal combustion engineby means of its starting mechanism can be started. As soon as the enginehas started, it has the tendency in View of the excssive startingfilling to assume a high speed. This tendency is opposed by the governorof the engine which governor then moves control rod 6 in a direction toreduce :the filling and does so until it occupies a position whichcorresponds to its position during the idling of the engine. During thelast mentioned readjustment of control rod 6, window 16 again releasesthe wire spring 13 so that the latter will again occupy the positionshown in Figs. 1 and -2 and thereby determine the full load filling.When the internal combustion engine is under load, the governor candisplace control rod 6 only in a direction to increase the filling untilthe ear 12 abuts the free end of wire spring 13. v V

Fig. 3 illustrates a simple arrangement which will make it possible toprevent the adjustment of the starting quantity of'fuel while theinternal combustion engine associatedwith said pump is already inoperation. With the arrangement of Figs. 1 and 2, it would be possibleby 4 arresting the bolt 17 in its inwardly pressed position, forinstance, by placing a band over said bolt '17 in its inward depressedposition, to have the pump continuously deliver the quantity of fuelintended for the starting period only. In order to preventsuch undesiredmanipu lation, according to Fig. 3, the ear 12a has its end portion 21bent once more so that the thus formed end surface 22 will be parallelto the sheet metal plate 10a. The length of the end portion 22 in axialdirection of the control rod 6a is so selected that the free edge of theend surface 22 engages the bolt 17a as soon as the tip of the wirespring 134: has moved only slightly into the window 16a.

If the operator now arrests the bolt 17a in its inwardly pressedposition, the control rod 6a can only to a very minor extent, i.e.,until the end surface 22 engages the circumference of bolt 17a be movedbeyond the normal permissible full load quantity.

The bolt 17a has associated therewith a withdrawing spring 23a. Thisspring normally returns the bolt 17a to its outer position whenfollowing its pressing inwardly, the tip of the wire spring 13a hasentered the window which is provided in the ear 12a and corresponds tothe window 16 .of Fig. 2. It will be appreciated that when the bolt 17ais moved outwardly, it is out of the range of movement of the endsurface 22 so that the ear 12:: will be pulled over the Wire spring 13auntil it abuts the adjacent end surface of the sleeve 19a.

The invention may also be used in connection with fuel injectionpumpswhich do not have a separate control rod. Such an arrangement is shown,for instance, in

Figs. 4 and 5. The various parts shown in these figures andcorresponding to those of Figs. 1 and 2. have been designated with thesame reference numerals as in Figs.

:1 and 2 but with the additional character [1.

The one cylinder fuel injection pump shown in Figs. 4 and 5 is equippedwith a hydraulic control comprising a control member acted upon by theoverflow fuel. The

said control member is represented by a piston 24. The hydraulic controlalso comprises control springs 25 and a device for adjusting the controlby varying the preload upon the springs. The said adjusting devicecomprises a pin 27 acting upon a spring disc 26, and also comprises atwo arm lever 28. (The movements of the control piston 24 are, in orderto prevent the transfer of control vibrations or oscillations, conveyedto a two arm lever 30 by means of a leaf spring 29. The two arm lever 30is The other free end of the lever 30 has connected thereto a bolt 32with a ball head :33. This ball head, similar to the arrangement ofFigs. -l to 3, extends into an axial groove 34 of a bushing 35 connectedto the pump piston 4b. Thus, a tilting movement of the lever 30 as aresult of a displacement of the control piston 24, will bring about arotative or angular adjustment of the pump piston 4b. Thelever 30 has acylindrical bore 36 and a transverse bore 37 extending .transverse tothe bore 36. A spring wire 13b extending through bore 37 is connected toan adjusting screw 14b and the tip of the spring wire 13b may be bent ordeflected so that it will be in front of the transverse bore 37. In itsnormal, i.e., unbent position, the tip of the spring Wire 13b engagesthe oppositely located surface of the cylindrical bore 36 laterally ofthe transverse bore 37 and thus acts as an abutment for the lever 30 toprevent further tilting movement thereof. This abutment determines thefull load quantity of fuel during .the normal operation of therespective internal combustion engine.

For purposes of'adjusting the pump for delivering the starting quantityof fuel, the actuating bolt 38 is against the thrust of the spring 23bmoved into the casing and deflects the tip of the spring wire 13b sothat itwill be in front of the transverse bore 37. The lever 30 can nowtilt further up to its abutment against the abutment screw 39 shown inFig. 4 and adjusted for the respective starting quantity of fuel. Thearrangement also comprises a second abutment screw 40 for adjusting thequantity of fuel for idling of the engine. The bolt 38 carries amanually operable knob 41* and simultaneously serves for turning oif thefuel pump. To, this end, the knob is rotated against the thrust of thespring 23b which also acts as torsion spring; During this movement, thepin 42 extending in a direction perpendicular to the axis of the bolt 38takes along the lever 30 through the intervention of a pin 43 in thelever 30 so that the lever 30 is moved into position for no delivery.

The arrangement according to Figs. 4 and operates in the followingmanner. It may be assumed that an internal combustion engine equippedwith an arrangement according to Figs. 4 and 5 is in its rest position.In such an instance, lever 30 occupies a position shown in Fig. 4 inwhich it determines the full load filling for the fuel injection pump;The inner wall of bore 36 of lever 30 will then adjacent bore 37 restagainst wire spring 13b. In order to adjust the starting filling for theengine which exceeds the full load filling, wire spring 13b is by meansof bolt 38 displaced laterally so that it comes into the range of bore37. The control spring 25 then by means of piston 24 and spring 29displaces lever 30 in a direction to increase the filling until lever30abuts the abutment screw 39. The internal combustion engine can thenbe started.

After the engine has developed a higher speed, the governor will theneffect a return adjustment so that Wire spring 13 will return to itsnormal position and thereby determine the full load fuel quantity.

In order that similar to the arrangement of Fig. 3 it will. beimpossible to adjust the pump for delivering the starting quantity offuel While the internal combustion engine is running, the arrangement ofFigs. 4 and 5 is provided with a plate 44. This plate 44 which isconnected to the lever 30 by means of screws or rivets 45 partiallycovers up the bore 36. The edge 46 of plate 44 faces the bolt 38 andengages the bolt 38 when the latter is pressed inwardly, i.e., at a timewhen the tip of the wire spring 13 has onlyslightly entered thetransverse bore 37. The adjustment of the pump for delivering thestarting quantity of fuel will then be possible only afterthe bolt 38has been released and has moved outwardly.

Bolt 38 is provided with a pin 42 which during rotation of bolt 38 abutsa pin 33 in lever 30; In this way lever 30 may be adjusted for nofilling so that the internal combustionengine will be stopped. 4

It is, of course, to be understood that the present invention is, by nomeans, limited to the particular constructions shown in the drawings,but also comprises many modifications within the scope of the appendedclaims.

What we claim is:

1. In combination in an adjustable stop arrangement for fuel pumps: arotatable adjustable member, a casing, a control member mounted in saidcasing and movable in a first and a second direction opposite to saidfirst direction, means connected to said control member and arranged inoperative engagement with said adjustable member to adjust the latter ina first sense in response to a movement of said control member in saidfirst direction and to adjust said adjustable member in an oppositesense in response to a movement of said control member in said seconddirection, a substantially rigid abutment element carried by saidcontrol member, a bendable resilient abutment element mounted in saidcasing and arranged normally to abut said rigid abutment element tolimit the movement of said control member in said first direction, saidrigid abutment element being provided with a window adjacent thatsurface of said rigid abutment element which is normally in abutmentwith said resilient abutment element, and means reciprocably mounted insaid casing and operable to movethe free end of said resilient abutmentelement inv front of said window to thereby make said resilient abutmentelement ineffective as abutment and to allow movement of saidcontrolrnember in said first direction beyond its normal position foradjusting said rotatable adjustable member in said first sense.

2. In combination in an adjustable stop arrangement for fuel pumps:arotatable adjustable member, a casing, a control member mounted in saidcasing and movable in a first and a second direction opposite tosaidfirst direction, means connected to said control member and arrangedin operative engagement with said adjustable member to rotate the latterin a first sense in response to a movement of said control member insaid first direc tion and to rotate said adjustable member in a secondsense opposite to said first sense in response to a movement of saidcontrol member in said second direction, a substantially rigid abutmentelement carried by said control member, a bendable resilient abutmentelement mounted in said casing and arranged normally to abut said rigidabutment element to limit the movement of said control member in saidfirst direction, said rigid abutment element being provided with awindow adjacent that surface of said rigid abutment element. which isnormally in abutment with said resilient abutmentelement, a bolt memberreciprocably mounted in said casing and movable into engagement withsaid resilient abutment element for moving the free end thereof in frontof saidwindow, and resilient means continuously urging said bolt memberaway from said resilient abutment element.

3; Anarrangement' according to claim 2, in which said resilient abutmentelement consists of a deflectable bar;

4. In combinationin an adjustable stop arrangement for fuel pumps:rotatable adjustable member, a casing, a control member mounted in saidcasing and movable in a first and a seconddirection opposite to saidfirst direction, means connected to said control member and arrangedinoperative engagement with said adjustable member to rotate the latterin a first sense in response. to a movement of said control member insaid first direction and to rotate said adjustable member ina secondsense opposite to said first sense in response to a movement of saidcontrol member in said second direction, a substantially rigid abutmentelement carried by said control member, an adjusting screw threadedlyengaging saidcasing and accessible from the outside thereof, a bendableresilient abutment element fixedly connected to said adjusting screw andarranged normally to abut said rigid abutment element to limit themovement of saidcontrol member in said firstdirection, said rigidabutment element being provided with a window adjacent that surface ofsaid rigid abutment element which is normally in abutment with saidresilient abutment element, and deflecting means reciprocably mounted insaid casing and operable to move the free end of said resilient abutmentelement in front of said window to thereby make said resilientabutmentelement ineffective as abutment and to allow movement of saidcontrol member in said first direction beyond its normal position forrotating said adjustable memberin said first sense.

5. In combination in an adjustable stop arrangement for fuel pumps: arotatable adjustable member; a casing, a control member mounted in saidcasing and movable in a first and a second direction opposite to saidfirst direction, means connected to said control member and arranged inoperative engagement with said adjustable member to rotate the latter ina first sense in response to a movement of said control member in saidfirst direction and to rotate said adjustable member in a second senseopposite to said first sense in response to a movement of said controlmember in said. second direction, a metal plate connected to saidcontrol member and being providedwith an ear normally serving as rigidabutment element to limit the movement of said control member in saidfirst direction, a bendable resilient abutment element mounted in saidcasing and arranged normally to abut said rigid abutment element, saidear being provided with a window adjacent that surface of said rigidabutment element which is normally in abutment with said resilientabutment element, and means reciprocably mounted in said casing andoperable to move the free end of said resilient abutment element infront of said window to thereby make said rigid abutment elementineffective as abutment member and .to allow movement of said controlmember in said first direction beyond its normal position for rotatingsaid adjustable member in said first sense.

6. An arrangement according to claim 5, in which said Window is arrangeddirectly adjacent the line of intersection of said ear with said metalplate and has a rectangular contour, the larger side of said windowbeing substantially parallel to the direction of movement of saidcontrol member and the shorter side of said window being wider than theWidth of said resilient abutment element.

7. In combination in an adjustable stop arrangement for fuel pumps: arotatable adjustable member, a casing, a control member mounted in saidcasing and movable in a first and a second direction opposite to saidfirst direction, means connected to said control member and arranged inoperative engagement with said adjustable member to rotate the latter ina first sense in response to a movement of said control member in saidfirst direction and to rotate said adjustable member in a second senseopposite to said first sense in response to a movement of said controlmember in said second direction, a metal plate connected to said controlmember and provided with an ear normally serving as abutment to limitthe movement of said control member in said first direction, a bendableresilient abutment element mounted in said casing and arranged normallyto abut said rigid abutment element, said ear being provided with awindow adjacent that surface of said rigid abutment element which isnormally in abutment with said resilient abutment element, said metalplate also being provided with a second ear arranged in spacedrelationship to said first ear and provided with a guiding opening,guiding means connected to said casing and extending through saidguiding opening, and deflecting means reciprocably mounted in saidcasing and operable to move the free end of said resilient abutmentelement in front of said window to thereby make said resilient abutmentelement ineffective as abutment and to allow movement of said controlmember in said first direction beyond its normal position for rotatingsaid adjustable member in said first sense.

8. An arrangement according to claim 7, in which that end of saidguiding means which faces said first ear is arranged in the path of thelatter to limit the movement of said control member in said firstdirection by engagement with said first ear.

9. In combination in an adjustable stop arrangement for fuel pumps: arotatable adjustable member, a casing, a control member mounted in saidcasing and movable in a first and a second direction opposite to saidfirst direction, means connected to said control member and arranged inoperative engagement with said adjustable member to rotate the latter ina first sense in response to a movement of said control member in saidfirst direction and to rotate said adjustable member in a second senseopposite to said first sense in response to a movement of said controlmember in said second direction, a metal plate connected to said controlmember and provided with an ear having a first section substantiallyperpendicular to the major surface of said metal plate and having asecond section spaced from and substantially parallel to said majorsurface, a bendable resilient abutment element mounted in said casingand arranged normally to abut the major surface of said metal plate tolimit the movement of said control member in said first direction, saidmetal plate being provided with a window adjacent said first section ofsaid ear, and a reciprocable member reciprocably mounted in said casingand operable to move the free end of said resilient abutment element infront of said Window to allow saidresilient abutment element to entersaid window, said second section of said ear being arranged to abut saidreciprocable abutment element when said resilient member has justentered said window.

10. In combination in an adjustable stop arrangement for fuel pumps: anadjustable member, hydraulic control means for rotatively adjusting saidadjustable member, a casing housing said hydraulic control means, levermeans tiltably mounted in said casing and operatively connected to saidhydraulic control means to be tilted by the latter, said lever meansbeing tiltable in a first direction opposite to said first direction anda second direction, means connected to said lever means and arranged inoperative engagement with said adjustable member to rotate the latter ina first sense in response to a movement of said lever means in saidfirst direction and to rotate said adjustable means in a second senseopposite to said first sense in response to a movement of said levermeans in said second direction, said lever means having a first boretherein with the axis thereof perpendicular to the tilting direction ofsaid lever means and also being provided with a second bore transverseto said first bore and leading into said first bore, a bendableresilient abutment element extending through said second bore into saidfirst bore and normally abutting the inner surface wall of said firstbore, said resilient abutment element having its. end remote from saidsecond bore fixedly mounted, said first bore also being provided with awindow laterally of the axis of said second bore but on that wallportion of said first bore which is faced by the free end of saidresilient abutment element, and means reciprocably mounted in saidcasing and operable to move the free end of said resilient abutmentelement in front of said window to thereby make said resilient abutmentelement ineffective as abutment and allow said lever means to tilttoward the fixed end of said resilient abutment element.

11. An arrangement according to claim 10, in which said reciprocablemember is also rotatable and is provided with follower means forengagement with said lever means to selectively cause said lever meansto rotate in a direction to cause the means connected to said levermeans and arranged in operative engagement with said adjustable memberto rotate the latter into a certain third position.

12. In combination in an adjustable stop arrangement for fuel pumps: anadjustable member, hydraulic control means for rotatively adjusting saidadjustable memher, a casing housing said hydraulic control means, levermeans tiltably mounted in said casing and operatively connected to saidhydraulic control means to be tilted by the latter, said lever meansbeing tiltable in a first direction and a second direction opposite tosaid first direction, means connected to said lever means and arrangedin operative engagement with said adjustable member to rotate the latterin a first sense in response to a movement of said lever means in saidfirst direction and to rotate said plunger in a second sense opposite tosaid first sense in response to a movement of said lever means in saidsecond direction, said lever means having a first bore therein with theaxis thereof perpendicular to the tilting direction of said lever meansand also being provided with a second bore transverse to said first boreand leading into said first bore, a bendable resilient abutresilientabutment element, means reciprocably mounted in said casing and operableto move the free end of said resilient abutment element in front of saidwindow to thereby make said resilient abutment element ineitective asabutment and allow said lever means to tilt toward the fixed end of saidresilient abutment element, and sheet metal means partly covering saidfirst bore at the entrance portion thereof, said sheet metal meansengaging said reciprocable means mounted in said casing when the tip ofthe resilient abutment element has slightly entered said window.

13. In combination in an adjustable stop arrangement for fuel pumps: anadjustable member, a casing, a control member reciprocably mounted insaid casing and provided with means engaging said adjustable member forselectively adjusting the same in one or the opposite direction,extension means connected to said control member, a flexible firstabutment element normally having one end thereof in abutment with saidextension means to thereby hold said adjustable member in a firstposition, spring means continuously urging said extension means to movein a direction toward the other end of said abutment element, a secondabutment element spaced from said one end of said first abutment elementin axial direction thereof and in a direction toward the other end ofsaid first abutment element, said extension means being provided with awindow near the normal point of contact of said one end of said firstabutment element with said extension means, and manually operabledeflecting means operable to deflect said one end of said first abutmentelement to bring said one end into alignment with said window therebycausing said spring means to move said extension means into contact withsaid second abutment element and causing said control member connectedto said extension means to move said adjustable member into a secondposition.

14. An arrangement according to claim 13 in which the flexible abutmentmember has connected thereto a threaded portion threadedly andadjustably engaging a threaded bore in said casing for fine adjustmentof said first abutment element.

References Cited in the file of this patent UNITED STATES PATENTS2,509,358 Krieg May 30, 1950 2,716,901 Howe Sept. 6, 1955 2,729,168Ziesche Ian. 3, 1956

